Carburetor



D. 16, 1930. ,1 w FULwlLER 1,785,026

CARBURETOR Filed April 30, 1927 2 Sheets-Sheet l lll/1111111111 will r/ s 2";

l ATTORNEY.

`IPatented Dec. 16, 1930 UNITED STATES PATENT OFFICE ARTHUR W. FULWILEB, I?A HIGHLAND PARK, MIlLGHIGAN, ASSIGNOR T0 .THE `(HUIS-- l DALLA. FLOATLESSCARBURETOR CORPORATION caminamos Application ledApril 30, 1927. Serial No. 187,781.`

My invention relates to a new and usefulv improvement ina carburetor, and has for its object the provision of a carburetor in which the flow of fuel to the engine may be assured at al1 times, and in which particularly is the flow offuel to the engine reguf lated so that it proceeds to the engine in the desired quantities demanded by the engine dependent upon its speed and acceleration.

In'the use of a carburetor with an internal combustion enfrine there are periods in theoperation of the engine atwhich a propor- 1 tionately greateramount of fuel is desired than is required by the engine running at a slightl For e cient operation o to automatically take care of the low of the fuel and supply the larger proportion of fuel at the critical times, and the present invention provides a mechanism for accomplishing this` controlfor shutting olf the flow of the fuel to the carburetor when the engine is stopped, and automatically opening the samejupon the starting of the engine.

Other objects will appear hereinafter.

The invention consists in the combination and arrangement of parts hereinafter described and claimed. i y

g The inventionwill bebest understood by a reference to the accompanying drawings which form a part of this specificationzand in which,

1 is a side elevational view of the invention.

Fig. 2 is a central vertical sectional view of the invention.

Fig. 3 is a view taken on substantially line 3;-3 of Fig. 1.

Fig. 4 is a view taken on substantially line 5o.' 4 4 of Fig. 1.

lower or a slightly` higher speed.- the engine it is desirable that the carburetorbe so arranged as Fig. 5 is an exploded erspective view of passage eommunicating'vvith the passage y 11 formed in the -arm v12 which carries the open sleevelB, of Venturi bore.` Secured to and communicating with the lower end of'` the casing 8 is an air intake pipe ,14'controlled by the butterfly valve 115 adapted tov engage the adjusting screw 16, a suitable gasi ket 17 being interposed between the casing 8 and the pipe 14. The passage 10 communi- Cates with the passage 18 formed in the nipple 19. The assa e 18 communicateswith the interior o the projection 20 in which is threaded the plug 21, engaging against which is one end of the spring 22, the other end engaging an enlargement 23 on the needle valve stem 24, this needle valve stem carrying at its upper end a cap 25. The other end of the needle valve stem is adapted to engage the seat in the plug 26 which is threaded into the projection 27 closed by the plug 28. A passage 29 extends into the chamber 30, this chamber communicating through the passage `31 with the chamber 32 with which communicates a fuel delivery pipe or conduit 433.

. Mounted on the body 34 in any suitable ma-nf` which is slidably positioned ahead 37 4pro-- aok jecting from which is the neck v38'ca1'rying the needle valve 39adaptedto engage a sea-t at the end of the passage 31. Communicating with the recess 36 is Va pipe onconduit 40 which is connected in communieationwith theY intake manifold 7. The llower face -of the head 35 is provided with-a recess41.

Carried by the member 38 and clamped be-` tween the gasket 36 and the" body 34 is al flexible diaphragm-42provded with a plurality of openings 43 through which the screws 44 may be projected. A dowel 45 projects from the face of the head and is adapted to engage in one of the openings 43 of the flexible diaphragm 42 to properly seat the head on the diaphragm. The passage 31 is formed in a neck 46 carrying the disc 47 and provided with the nut 48, the endV ed at one end on the upper surface of the arm 55 and spaced therefrom at its opposite end, the distance of spacing being determined by the adjusting screw 57 .I A cam 58 fixedly mounted upon the shaft 59 is adapted to engage the spring 56 and cause a rocking of the arm 53 upon its pivot so as to raise, against the tension of the spring 22, the needle valve 24 from its seat. Fixedly connected to the shaft 59 is an arm 60 connected to the rod'61 which extendsto a position accessible to the operator of the vehicle and which is operated by the throttle control, the butterfly valve 62 being mounted on the shaft 59 interior of the casing 8.

A passage 63 communicates with the passage 18 and with the by pass pipe or conduit 64 which communicates with the interior of the casing 8 b means of the opening 65.

The butter y valve 15 is fixedly mounted upon the shaft 66 which extends through the bracket 67 fastened upon the pipe or conduit 14. An arm 68 is fixedly mounted upon the shaft 66 and connected with the y[wire 69 which extends to the dash or other convenient location for adjustment of the air intake.

.openings 70 through which screws or other fastening vmeans may be projected, and a tongue 71 projects, from one side of the bracket. By having the bracket constructed in the manner indicated and arranged with the additional openings, a universal bracket is provided which may be easily and quickly mounted on an air conduit 14 of different types, or mounted at different positions on the conduit 14.

In operation, after the device has been attached to the manifold 7 as illustrated in the drawings, when the engine is started, the suction in the cylinders Will flex the diaphragm 42 so as to raise' the needle valve 39 from its seat, and permit the flow of fuel into the mixing chamber 8, whence it will pass, mixed with the air entering through the pipe 14, into the explosive chambers of the engine.

The throttle control is used to .rock the arm 53 so as to raise the needle valve 23 from its seat, and permit the iow of the desired amount of fuel into the mixing chamber 8. When the throttle is moved to closed position, the valve 23 will be lifted from its seat sufficiently to permit gas to pass through the by pass pipe 64 above the butterfly 62 for enabling the engine to idle. The chamber 32 is provided so that a supply of the fuel will always be present below the passage 31, vand a read delivery of the gas to the mixing cham er 8 effected. When the throttle is opened and the as is delivered through the passage 10, 1t will pass through the sleeve 13 which is provided with the Venturi bore, this arrangement effecting a thorough mixing of the gases with the air. Operating in this manner, I have provided a carburetor which is most efficient and in which the objects set out are attained.

While I have illustrated 'and described the preferred form of my invention, I do not wish to limit myself to the precise'details of structure shown, but desire to avail myself of such variations and modifications as come within the scope of the appended claim.

Having thus described my invention what I claim as new and desire to secure by Let-4 ters Patent is:

A carburetor of the class' described, 'comprising: a mixing chamber; an arm projecting outwardly to said mixing chamber; a sleeve carried on the outer end of said arm of Venturi bore and communicating throu h a lateral opening with a passage forme in said 'arm;,a nipple secured to the periphery of said mixing chamber and communicating through its bore and through a passage formed -in said mixing chamber with the passage in said arm; a chamber forming member carried on said nipple; a fuel conduit communicating with the chamber in said chamber forming member; a valve for closing communication between said fuel conduit and said passages, said valve being normally slight y open; an additional valve for controlling communication between said conduit and said passages; and a flexible diaphragm, fiexib e in response to the suction of the engine for raising, upon flexing, said additional valve to open position.

In testimony whereof I have signed the foregoing specification.

ARTHUR W. FULWILER. 

